@article{1183735337, author = {Robinson, Abraham}, title = {Review: Leon Henkin, G. Kreisel, Sums of Squares}, journal = {J. Symbolic Logic}, volume = {31}, number = {1}, year = {1966}, pages = { 128-129}, language = {en}, url = {http://dml.mathdoc.fr/item/1183735337} }
Robinson, Abraham. Review: Leon Henkin, G. Kreisel, Sums of Squares. J. Symbolic Logic, Tome 31 (1966) no. 1, pp. 128-129. http://gdmltest.u-ga.fr/item/1183735337/